Bug Description

Not a bug. Only a feature addition.

This is to provide compatibility with the old 'image' command in stratoscript. The intention is to load an image using altitude/azimuth coordinates and have the image distorted according to the azimuthal grid. This will also be useful for dome projections, where image distorted with azimuthal reference frame is more suitable for dome view. As of now the skylayer only draws using an Equatorial reference frame.